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Differences What are the advantages of each

Front view of Mobility Radeon HD 3870

Reasons to consider the
ATi Mobility Radeon HD 3870

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Better PassMark score 728 vs 400 More than 80% better PassMark score
Higher memory bandwidth 54.4 GB/s vs 14.4 GB/s More than 3.8x higher memory bandwidth
Much wider memory bus 256 bit vs 64 bit 4x wider memory bus
Higher pixel rate 10.56 GPixel/s vs 1.8 GPixel/s More than 5.8x higher pixel rate
More render output processors 16 vs 4 12 more render output processors
More shading units 320 vs 48 272 more shading units
Front view of GeForce GT 520MX

Reasons to consider the
Nvidia GeForce GT 520MX

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Higher clock speed 900 MHz vs 660 MHz More than 35% higher clock speed
Lower TDP 20W vs 55W 2.7x lower TDP

Benchmarks Real world tests of Mobility Radeon HD 3870 vs GeForce GT 520MX

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Mobility Radeon HD 3870  vs GeForce GT 520MX 

memory bandwidth Rate at which data can be read from or stored in onboard memory

pixel rate Number of pixels a graphics card can render to the screen every second

Mobility Radeon HD 3870
10.56 GPixel/s
GeForce GT 520MX
1.8 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Mobility Radeon HD 3870
10.56 GTexel/s
GeForce GT 520MX
7.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 520MX
172.8 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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